I'm going to shoot a guess that the engineers were thinking about burning wood in the Vigilant. If you are burning wood, then, for sure, skip the baro damper, but if you are burning only coal, then I'd surely get a Dwyer #25 manometer and do things right. A properly adjusted barometric damper will save fuel. Think of it this way..if you do not have a barometric damper then when the draft is a bit high (windy day, cold weather, hotter fire) then you are losing heat up the chimney. Some people think a barometric damper loses heat up the chimney, but it's more like this: Would you rather lose 500 degree stove air up the chimney or lose 72 degree house air up the chimney?